Older Linhof 617S with 90mm F/5.6 Lens

I Bought a Older Linhof 617S with 90mm F/5.6 Lens Non-Interchangeable with a
Schneider-Kreuznach Center Filter 4 Multicoating. I need a THIN UV Filter
for the front of the center filter ( Will This effect the corners of the
film? ). And a Lens cap for the front of the center filter and UV for
protection. The thing is I have no idea what the size is for the front of
the Center Filter. It's huge. Maybe 105mm??

Thank you,
Ron Hammer
http://home.comcast.net/~rhammer47


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Thank you,
Ron Hammer
http://home.comcast.net/~rhammer47